As two trains move along a track, their conductors suddenly notice that they are headed toward each other.

As two trains move along a track, their conductors suddenly notice that they are headed toward each other. Figure 2-27 gives their velocities v as functions of time t as the conductors slow the trains. The figure's vertical scaling is set by vs- 40.0m/s. The slowing processes begin when the trains are 200 m apart. What is their seperation when both trains have stopped?